A preparation method of mesoporous a-r mixed crystal titanium oxide with controllable rutile content

An A-R, titanium oxide technology, applied in titanium dioxide, hydrocarbon production from carbon oxides, chemical instruments and methods, etc., can solve the problems of long preparation cycle, shortened reaction time, uneven mass transfer, etc., and achieves simple and easy preparation conditions and processes. The effect of controlling and supporting active components is stable, and the photocatalytic performance is excellent.

Inactive Publication Date: 2014-10-15
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a long preparation cycle and requires sintering at 600-1100°C, which consumes a lot of energy and affects its application prospects. On this basis, our research group placed the reaction in a humid atmosphere, thereby shortening the reaction time [Patent 200710025816.X]; but there are also shortcomings such as the need to react in a humid atmosphere, high requirements for equipment, and uneven mass transfer
Moreover, the existing process cannot adjust the crystal form of mesoporous titanium oxide by adjusting the acid concentration.

Method used

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  • A preparation method of mesoporous a-r mixed crystal titanium oxide with controllable rutile content

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Effect test

Embodiment 1

[0030] Anatase titanium oxide and sodium hydroxide are fully mixed (TiO 2 :Na 2 O=0.25), roasted at a temperature of 300°C for 2h, using H + Concentration is 10 -0.5 mol / L nitric acid solution to clean the titanate (that is, soak the alkali metal titanate for 2 hours), and finally bake it in a muffle furnace at 500°C for 4 hours to obtain mesoporous titanium oxide with a most probable pore diameter of 4nm , the specific surface area is 90m 2 / g, the pore volume is 0.2cm 3 / g, the crystal form is rutile titanium oxide, wherein the rutile content is 100wt%.

Embodiment 2

[0032] Anatase titanium oxide and sodium hydroxide are fully mixed (TiO 2 :Na 2 O=0.25), roasted at a temperature of 300°C for 4h, using H + Concentration is 10 -1 mol / L nitric acid solution to clean the titanate (that is, soak the alkali metal titanate for 3 hours), and finally bake it in a muffle furnace at 300°C for 4 hours to obtain mesoporous titanium oxide with a most probable pore diameter of 2nm , the specific surface area is 150m 2 / g, the pore volume is 0.5cm 3 / g, the crystal form is rutile titanium oxide, wherein the rutile content is 100wt%.

Embodiment 3

[0034] Orthotitanic acid and sodium carbonate are fully mixed (TiO 2 :Na 2 O=1), baked at a temperature of 500°C for 0.5h, using H + Concentration is 10 -1.3 mol / L hydrochloric acid solution to clean the titanate (that is, soak the alkali metal titanate for 5 hours), and finally bake it in a muffle furnace at 550°C for 2 hours to obtain mesoporous titanium oxide with the most probable pore diameter of 40nm, the specific surface area is 60m 2 / g, the pore volume is 0.18cm 3 / g, the crystal form is a mixed crystal structure of anatase and rutile, wherein the rutile content is 45wt%.

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Abstract

The invention discloses a preparation method of mesoporous A-R mixed crystal titanium oxide with controllable rutile content, which includes that sodium salt and compound containing titanium are mixed and then roasted for 0.2 to 6 hours at high temperature of 100-550 DEG C to obtain alkali metal titanium acid salt; the alkali metal titanium acid salt is washed by using acid solution of different concentration, and finally dehydration processing is performed to obtain the mesoporous A-R mixed crystal titanium oxide with the controllable rutile content, 2-50nm hole diameter, 30-300m<2> / g specific surface area and 0.1-0.5 cm<3> / g hole volume; and the rutile content in a mesoporous A-R mixed crystal titanium oxide product is regulated by adjusting concentration of the acid solution adopted for washing the alkali metal titanium acid salt. The mesoporous A-R mixed crystal titanium oxide with the different rutile content can be obtained through regulation of the concentration of the acid solution for washing Na salt, and the mesoporous A-R mixed crystal titanium oxide has the advantages of being stable in supported active components and excellent in photochemical catalysis performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic porous catalytic materials, in particular to a preparation method of mesoporous A (anatase titanium oxide)-R (rutile titanium oxide) mixed crystal titanium oxide with controllable rutile content. Background technique [0002] Energy crisis and environmental pollution are two major challenges faced by human beings in the 21st century. According to the photosynthesis of plants, people have designed an "artificial leaf", which is a system that converts greenhouse gas CO 2 As a raw material, with the participation of sunlight, it is converted into CO or CH with higher combustion value 4 or CH 3 OH, and then converted to CO by human activities 2 , and so on, it can not only solve the environmental problems caused by greenhouse gases, but also provide clean energy for human beings. [0003] Photocatalytic reduction of CO 2 As early as 30 years ago, Professor Fujishima began to try t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053B01J21/06B01J32/00B01J23/42C07C9/04C07C1/12
Inventor 杨祝红施荣华姚文俊王昌松冀超朱育丹刘畅陆小华
Owner NANJING TECH UNIV
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